Video memory, very high or default?

[Video memory, very high or default?]

8800gt 512 mb,

playing on very high, playable fps and no error.

[Incredible BOOST in Game Performance with old nvidia Drivers]

I feel that the older driver make the graphic more worst.

[Very slow and glitchy problems.]

GeForce/ION Driver Release 185.85 driver or 186.08 beta?

[Very slow and glitchy problems.]

Problems is a bit lower on lowest quality.

[Very slow and glitchy problems.]

No idea? :(

[Very slow and glitchy problems.]

Setting:

Texture= high

memory = default

shadow = medium

post = very high

distance = 3000m

Aniso = low

Terrain = medium

object = medium

1280x1024

100% fillrate

So heres the problems, i started playing in campaign, i reached the boat scene and it took around 10 sec for the texture to pop up, happen in every single mission, also, when there is a cut scene, the animation can be laggy and the voice are really slow and the noise are funny, everytime i turn back i will be freezing for around 1-2 sec and the texture would have disapeared and have to wait 4-5 sec before the texture come back.

My fps are also pretty low.

core 2 quad q6700

2gb ram

8800gt 512mb 181.22 driver

What is wrong?